////////////////////////////////////////////////////////////////////////
//
// Copyright (C) 2011-2021 The Octave Project Developers
//
// See the file COPYRIGHT.md in the top-level directory of this
// distribution or <https://octave.org/copyright/>.
//
// This file is part of Octave.
//
// Octave is free software: you can redistribute it and/or modify it
// under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Octave is distributed in the hope that it will be useful, but
// WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Octave; see the file COPYING.  If not, see
// <https://www.gnu.org/licenses/>.
//
////////////////////////////////////////////////////////////////////////

#if defined (HAVE_CONFIG_H)
#  include "config.h"
#endif

#include <QLineEdit>

#include "Container.h"
#include "EditControl.h"
#include "TextEdit.h"
#include "QtHandlesUtils.h"

#include "octave-qobject.h"

namespace octave
{

  EditControl*
  EditControl::create (octave::base_qobject& oct_qobj,
                       octave::interpreter& interp, const graphics_object& go)
  {
    Object *parent = parentObject (interp, go);

    if (parent)
      {
        Container *container = parent->innerContainer ();

        if (container)
          {
            uicontrol::properties& up = Utils::properties<uicontrol> (go);

            if ((up.get_max () - up.get_min ()) > 1)
              return new EditControl (oct_qobj, interp, go,
                                      new TextEdit (container));
            else
              return new EditControl (oct_qobj, interp, go,
                                      new QLineEdit (container));
          }
      }

    return nullptr;
  }

  EditControl::EditControl (octave::base_qobject& oct_qobj,
                            octave::interpreter& interp,
                            const graphics_object& go, QLineEdit *edit)
    : BaseControl (oct_qobj, interp, go, edit), m_multiLine (false),
      m_textChanged (false)
  {
    init (edit);
  }

  void
  EditControl::init (QLineEdit *edit, bool callBase)
  {
    if (callBase)
      BaseControl::init (edit, callBase);

    m_multiLine = false;
    initCommon (edit);

    uicontrol::properties& up = properties<uicontrol> ();

    if (up.enable_is ("inactive"))
      edit->setReadOnly (true);
    else
      edit->setEnabled (up.enable_is ("on"));
    edit->setText (Utils::fromStdString (up.get_string_string ()));
    edit->setAlignment (Utils::fromHVAlign (up.get_horizontalalignment (),
                                            up.get_verticalalignment ()));

    connect (edit, &QLineEdit::textEdited,
             this, &EditControl::textChanged);
    connect (edit, &QLineEdit::editingFinished,
             this, &EditControl::editingFinished);
    connect (edit, &QLineEdit::returnPressed,
             this, &EditControl::returnPressed);
  }

  EditControl::EditControl (octave::base_qobject& oct_qobj,
                            octave::interpreter& interp,
                            const graphics_object& go, TextEdit *edit)
    : BaseControl (oct_qobj, interp, go, edit), m_multiLine (true),
      m_textChanged (false)
  {
    init (edit);
  }

  void
  EditControl::init (TextEdit *edit, bool callBase)
  {
    if (callBase)
      BaseControl::init (edit, callBase);

    m_multiLine = true;
    initCommon (edit);

    uicontrol::properties& up = properties<uicontrol> ();

    if (up.enable_is ("inactive"))
      edit->setReadOnly (true);
    else
      edit->setEnabled (up.enable_is ("on"));
    edit->setAcceptRichText (false);
    edit->setPlainText (Utils::fromStringVector
                        (up.get_string_vector ()).join ("\n"));
    edit->setAlignment (Utils::fromHVAlign (up.get_horizontalalignment (),
                                            up.get_verticalalignment ()));

    connect (edit, &TextEdit::textChanged,
             this, &EditControl::textChanged);
    connect (edit, &TextEdit::editingFinished,
             this, &EditControl::editingFinished);
    connect (edit, &TextEdit::returnPressed,
             this, &EditControl::returnPressed);
  }

  EditControl::~EditControl (void)
  { }

  void
  EditControl::initCommon (QWidget*)
  {
    m_textChanged = false;
  }

  void
  EditControl::update (int pId)
  {
    bool handled = false;

    if (m_multiLine)
      handled = updateMultiLine (pId);
    else
      handled = updateSingleLine (pId);

    if (! handled)
      {
        switch (pId)
          {
          default:
            BaseControl::update (pId);
            break;
          }
      }
  }

  bool
  EditControl::updateSingleLine (int pId)
  {
    uicontrol::properties& up = properties<uicontrol> ();
    QLineEdit *edit = qWidget<QLineEdit> ();

    switch (pId)
      {
      case uicontrol::properties::ID_STRING:
        edit->setText (Utils::fromStdString (up.get_string_string ()));
        return true;

      case uicontrol::properties::ID_HORIZONTALALIGNMENT:
      case uicontrol::properties::ID_VERTICALALIGNMENT:
        edit->setAlignment (Utils::fromHVAlign (up.get_horizontalalignment (),
                                                up.get_verticalalignment ()));
        return true;

      case uicontrol::properties::ID_ENABLE:
        if (up.enable_is ("inactive"))
          edit->setReadOnly (true);
        else
          {
            edit->setReadOnly (false);
            edit->setEnabled (up.enable_is ("on"));
          }
        return true;

      case uicontrol::properties::ID_MIN:
      case uicontrol::properties::ID_MAX:
        if ((up.get_max () - up.get_min ()) > 1)
          {
            QWidget *container = edit->parentWidget ();

            delete edit;
            init (new TextEdit (container), true);
          }
        return true;

      default:
        break;
      }

    return false;
  }

  bool
  EditControl::updateMultiLine (int pId)
  {
    uicontrol::properties& up = properties<uicontrol> ();
    TextEdit *edit = qWidget<TextEdit> ();

    switch (pId)
      {
      case uicontrol::properties::ID_STRING:
        edit->setPlainText (Utils::fromStringVector
                            (up.get_string_vector ()).join ("\n"));
        return true;

      case uicontrol::properties::ID_HORIZONTALALIGNMENT:
      case uicontrol::properties::ID_VERTICALALIGNMENT:
        edit->setAlignment (Utils::fromHVAlign (up.get_horizontalalignment (),
                                                up.get_verticalalignment ()));
        return true;

      case uicontrol::properties::ID_ENABLE:
        if (up.enable_is ("inactive"))
          edit->setReadOnly (true);
        else
          {
            edit->setReadOnly (false);
            edit->setEnabled (up.enable_is ("on"));
          }
        return true;

      case uicontrol::properties::ID_MIN:
      case uicontrol::properties::ID_MAX:
        if ((up.get_max () - up.get_min ()) <= 1)
          {
            QWidget *container = edit->parentWidget ();

            delete edit;
            init (new QLineEdit (container), true);
          }
        return true;

      default:
        break;
      }

    return false;
  }

  void
  EditControl::textChanged (void)
  {
    m_textChanged = true;
  }

  void
  EditControl::returnPressed (void)
  {
    QString txt = (m_multiLine
                   ? qWidget<TextEdit> ()->toPlainText ()
                   : qWidget<QLineEdit> ()->text ());

    if (m_textChanged)
      {
        if (m_multiLine)
          emit gh_set_event (m_handle, "string",
                             Utils::toCellString (txt.split ("\n")), false);
        else
          emit gh_set_event (m_handle, "string",
                             Utils::toStdString (txt), false);

        m_textChanged = false;
      }

    if (txt.length () > 0)
      emit gh_callback_event (m_handle, "callback");
  }

  void
  EditControl::editingFinished (void)
  {
    if (m_textChanged)
      {
        QString txt = (m_multiLine
                       ? qWidget<TextEdit> ()->toPlainText ()
                       : qWidget<QLineEdit> ()->text ());
        if (m_multiLine)
          emit gh_set_event (m_handle, "string",
                             Utils::toCellString (txt.split ("\n")), false);
        else
          emit gh_set_event (m_handle, "string", Utils::toStdString (txt),
                             false);
        emit gh_callback_event (m_handle, "callback");

        m_textChanged = false;
      }
  }

}
